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单选题 When starting a centrifugal pump, the discharge valve should be ____
学科：轮机英语
时间：2023-12-18 15:45:28
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题目1单选题
Reduced capacity, accompanied by vibration and noise at the suction of a centrifugal pump is a result of____A. cavitationB. water hammerC. fluid frictionD. steam knock
题目2单选题
Common faults with centrifugal pumps, such as no discharge, may be a result of _______A. valves in the system being shutB. suction strainers blockedC. either A or BD. neither A nor B
题目3单选题
Which feature of a centrifugal pump reduces the need for renewing worn impellers and pump casingsA. Close radial clearance between impeller hub and casingB. Low rotational speed of impellerC. Removable end plateD. Replaceable impeller and casing wear rings
题目4单选题
Shaft sealing in a centrifugal pump can be affected by _____A. the mechanical sealB. packed stuffing boxesC. either A or BD. neither A nor B
题目5单选题
Centrifugal pumps are popular because they are very simple in construction, and produce smooth, constant, _____ dischargeA. non-pulsatingB. pulsatingC. positiveD. non-positive
题目6单选题
If a centrifugal pump were continually operated with the discharge valve closed, the _____A. motor controller overload would openB. pump would eventually overheatC. relief valve would continuously cycle openD. motor would overheat
题目7单选题
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by _____A. cavitationB. electrolysisC. abrasionD. friction
题目8单选题
The usual symptoms of cavitation in a centrifugal pump is _____A. noise and vibrationB. an increase in discharge pressureC. an increase in suction pressureD. lifting of the relief valve
题目9单选题
When starting a centrifugal pump, the discharge valve should be ____A. closedB. opened fullyC. cracked openD. partly open
题目10单选题
To maintain design discharge pressure from a centrifugal pump, the design clearance must be maintained between the _____A. shaft and impellerB. motor and pump shaftC. casing and impeller wearing ringsD. lantern ring and impeller
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